# Any device to detect hot water usage?

**URL:** <https://community.homey.app/t/any-device-to-detect-hot-water-usage/104997>\
**Category:** Devices\
**Created:** [February 26, 2024, 9:41pm UTC](https://community.homey.app/t/any-device-to-detect-hot-water-usage/104997 "2024-02-26T21:41:20Z")\
**Posts on this page:** 1\
**Showing post:** 7

<div class="post-metadata">

**Author:** ![Gruijter](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/gruijter/32/1973_2.png) [@Gruijter](https://community.homey.app/u/Gruijter)\
**Post date:** [February 27, 2024, 3:58pm UTC](https://community.homey.app/t/any-device-to-detect-hot-water-usage/104997/7 "2024-02-27T15:58:56Z")

</div>

I use the data straight from the boiler (combi-CV) using opentherm:

> [@\[APP\]\[Pro\] OpenTherm GateWay MQTT](https://community.homey.app/t/app-pro-opentherm-gateway-mqtt/77190):
>
> Homey App Store (stable version): Homey App Store (test version): [OpenTherm Gateway MQTT App for Homey | Homey](https://homey.app/en-us/app/com.gruijter.otgw/test) There already was an app for OpenTherm GateWay, OTGW for short (many thanks for your work @nlrb !): [OpenTherm Gateway App for Homey | Homey](https://homey.app/en-us/app/com.tclcode.otgw/OpenTherm-Gateway/) I tried to install it on my new Homey Pro 2023, but that was a no-go. Installing on my older Homey did work, but the connection was somewhat unstable, and the functionality was too heavy for my application. HP2023 and MQTT support I found out …

After 5 minutes shower the lights start to flicker, and after 8 minutes showering the temperature is regulated to an uncomfortable temperature. Works like a charm with my teenage kids!

---

_[View the full topic](https://community.homey.app/t/any-device-to-detect-hot-water-usage/104997)._